Patent US2601988A successfully refreshed from Google Patents.
US2601988A
Expired / Lapsed
US
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Transducer stylus and holder
Assignee: Astatic Corp
•
Filing: 1946-08-08
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Granted: 1952-07-01
•
Expires: 1966-08-08
Abstract
No abstract record available.
Inventors
- 👤 Creed M Chorpening
- 👤 Lester E Hadlock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:04
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB357698A
Cited
US2177239A
Cited
US2326460A
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US2326424A
Cited
US2432444A
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US2455913A
Cited
US2426061A
Cited
US2511664A
Cited
US2511663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-01 | 1955-12-31 | 1956-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-01 | 1959-12-31 | 1960-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-01 | 1963-12-31 | 1964-07-01 | $7700.00 | Window Closed / Lapsed |